fix(overview): call UseStaticWebAssets unconditionally; record Phase 4 results

Found during the live acceptance run. The host calls UseStaticWebAssets only when
the environment is literally "Development", so running the build output under any
other name - checking a staging registry locally, say - leaves the Theme RCL's
assets under _content/ unresolvable. The failure is silent and unhelpful: the page
returns 200 with its markup fully present and renders as a blank white screen,
because every stylesheet 404s. Calling it unconditionally is a no-op once
published (the manifest is gone and the assets are real files on disk), so the
only thing it changes is that failure. The container was never affected.

Phase 4 results recorded in the ledger: 7 of 9 design section 9 checks fully pass,
2 pass for ScadaBridge and are blocked for OtOpcUa pending a rig redeploy.

Notable live evidence:
- Leader chip moved from site-c-a to site-c-b when site-c-a was stopped, and the
  split-brain chip appeared while the pair was self-formed then cleared once it
  genuinely joined.
- Kill to Unreachable took two failing sweeps (the damping working as designed);
  recovery landed on the first good poll.
- Five consecutive page loads in 0.00-0.02s all showed the same "last sweep"
  timestamp, which is cache-first stated as a measurement.
- Freezing the probed endpoints while auto-refresh stayed RUNNING froze the poller
  mid-sweep and the cards aged into STALE on their own - staleness is computed at
  render, so a stuck poller needs no explicit stall detection.

The run also surfaced a pre-existing rig defect in both products: self-first Akka
seed lists mean a pair booted cold self-forms two 1-member clusters that never
join. After a --force-recreate every ScadaBridge node named ITSELF leader and every
node answered /health/active 200; restarting ONE node of each pair converged them
to one Leader plus one Active plus one Standby. That is the user's own open backlog
item (docs/plans/2026-07-22-initjoin-selfform-fallback.md, unexecuted), and the
dashboard made it visible fleet-wide in one screen.

170 tests, 0 warnings.

ZB.MOM.WW.Overview/src/ZB.MOM.WW.Overview/Program.cs

@@ -9,6 +9,14 @@ using ZB.MOM.WW.Telemetry.Serilog;
 
 var builder = WebApplication.CreateBuilder(args);
 
+// The host calls this itself, but ONLY when the environment is literally "Development". Running the
+// build output under any other name — checking a staging registry locally, say — leaves the Theme
+// RCL's assets under _content/ unresolvable, and the page renders as a blank white screen with its
+// markup fully present and every stylesheet 404. Calling it unconditionally is a no-op once
+// published (the manifest is gone and the assets are real files on disk), so the only thing it
+// changes is that failure.
+builder.WebHost.UseStaticWebAssets();
+
 // Pre-host presence check. The validator below covers shape and consistency, but it only runs once
 // the options are resolved — a registry section that is missing entirely binds to an empty
 // OverviewOptions, and the failure a reader can act on is "you configured no registry", not

docs/plans/2026-07-22-overview-dashboard-impl-plan.md.tasks.json

@@ -213,7 +213,22 @@
       "Rig ports verified by probing, not by reading compose (they disagree): OtOpcUa central-1/2 serve health on :9000 but site-* on :8080 (their explicit Kestrel listeners for LocalDb sync re-bind the primary HTTP port); ScadaBridge central on :5000, sites on :8084.",
       "ScadaBridge site nodes currently answer :8084/health/ready with 404 \u2014 MapZbHealth on sites is on the feat/site-node-health branch and the rig runs main. Phase 4 needs the rigs redeployed from the 0.2.0 branches.",
       "No leader chip renders on any group yet: the rigs run pre-0.2.0 builds whose akka check carries no data object. This is the designed graceful degradation, and it confirms Phase 4 must redeploy before checking design 9 item 2.",
-      "SUSPECTED RIG SPLIT-BRAIN: scadabridge-central-a AND central-b both return /health/active 200 with 'oldest Up member (singleton host)'. Two nodes cannot both be the oldest of one cluster. Verify during Phase 4 after redeploy \u2014 this is exactly the condition the dashboard exists to surface."
-    ]
+      "SUSPECTED RIG SPLIT-BRAIN: scadabridge-central-a AND central-b both return /health/active 200 with 'oldest Up member (singleton host)'. Two nodes cannot both be the oldest of one cluster. Verify during Phase 4 after redeploy \u2014 this is exactly the condition the dashboard exists to surface.",
+      "PRODUCT FIX during acceptance: Program.cs now calls builder.WebHost.UseStaticWebAssets() unconditionally. The host only calls it when the environment is literally 'Development', so running the build output under any other name (checking a staging registry locally) left the Theme RCL's _content assets 404 and the page rendered as a blank white screen with its markup fully present. No-op once published, so the container was never affected.",
+      "RIG DEFECT (pre-existing, both products): self-first Akka seed lists mean a pair booted cold self-forms two 1-member clusters that never join. Observed fleet-wide on ScadaBridge after a --force-recreate: every node named ITSELF leader and every node answered /health/active 200. Restarting ONE node of a pair makes it join the survivor and the pair converges to one Leader + one Active + one Standby. This is the user's own open backlog item (docs/plans/2026-07-22-initjoin-selfform-fallback.md, unexecuted). The dashboard surfaced it fleet-wide in one screen, which is what it is for.",
+      "Leader and Active legitimately diverge after a restart: Akka leader is lowest-address, ScadaBridge's active-node check is oldest Up member. site-c-a shows LEADER + STANDBY while site-c-b shows ACTIVE. Same divergence CLAUDE.md documents for OtOpcUa's Primary vs RoleLeader.",
+      "OUTSTANDING: the OtOpcUa docker-dev rig still runs a pre-0.2.0 build. Redeploying it needs a decision because the repo is checked out on feat/mesh-phase6, which carries 4 commits and an untracked Phase 7 plan beyond the base of feat/health-0.2.0-bump."
+    ],
+    "phase4_results": {
+      "1_all_render_single_active_per_pair": "PASS (ScadaBridge, all 4 pairs: one Active + one Standby, verified live) / BLOCKED (OtOpcUa rig runs pre-0.2.0 build with self-formed 1-member meshes, so all 6 nodes report Active)",
+      "2_leader_chip_and_split_brain": "PASS (ScadaBridge). Leader chip moved from site-c-a to site-c-b when site-c-a was stopped, and the split-brain chip appeared while the pair was self-formed then cleared once it genuinely joined. BLOCKED for OtOpcUa (deployed build emits no data object, so no leader chip \u2014 the designed graceful degradation, confirmed)",
+      "3_kill_and_restart": "PASS. Stopped scadabridge-site-c-a 12:01:27; Unreachable by 12:02:33 (two-strike damping = 2 failing sweeps). Restarted 12:04:01; Up again by 12:04:16, i.e. on the first good poll (recovery is deliberately asymmetric)",
+      "4_degraded_with_failing_entry": "PASS. Canned Degraded and Unhealthy endpoints render as Degraded/Down with the failing entry and its description visible, and check-dot ok/warn/bad classes per check",
+      "5_cache_first": "PASS. Five consecutive page loads in 0.00-0.02s, all showing the identical 'last sweep 12:17:44' header \u2014 the render never triggers a poll (an inline sweep could not finish in 10ms with two unreachable targets on 3s/10s timeouts)",
+      "6_pause_and_stuck_poller": "PASS both halves. Pause -> both cards STALE within the 10s window, KPI stale=2, 'Stale since'; Resume -> clean recovery. Separately, SIGSTOPping the endpoints while auto-refresh stayed RUNNING froze the poller mid-sweep and the cards aged into STALE on their own \u2014 staleness is computed at render, so a stuck poller needs no explicit stall detection",
+      "7_management_links_no_login": "PASS. 'Open CentralUI' opened http://localhost:9001 in a new tab (target=_blank rel=noopener); the dashboard itself never presented or redirected to a login",
+      "8_malformed_registry": "PASS both branches. No registry -> ConfigPreflight names Overview:Applications:0:Name and :Instances:0:BaseUrl. Stale window inside the poll interval -> validator names the keys and the consequence",
+      "9_health_and_metrics": "PASS. /health/ready, /health/active, /healthz, /metrics all 200; 16 gauge series with application/node/group labels"
+    }
   }
 }